Displacement testing is typically used for which frequency range?

Displacement testing is primarily associated with low frequencies because it is often used to assess the motion of machines and structures in this range where vibrations are most pronounced and have significant implications for design and safety. At low frequencies, the displacements from vibrations tend to be larger, making them more easily measurable and indicative of the operational conditions of machinery or structural integrity.

This type of testing focuses on the ability to capture significant movements, as low-frequency vibrations can be more challenging to control and mitigate, thus making it critical to accurately assess these frequencies.

In contrast, high frequencies tend to exhibit less displacement and can be harder to measure accurately with displacement sensors, while mid and ultra-high frequencies often require different techniques or sensors altogether, such as accelerometers, that are more suited to those frequency ranges due to the nature of the vibrations observed.